Process for preparing 2-aminothiazole-5-aromatic carboxamides as kinase inhibitors
a technology of aromatic carboxamide and aminothiazole, which is applied in the field of process for preparing 2aminothiazole5aromatic carboxamide, can solve the problems of less than desirable yield, respect for the production of side products, and use of expensive coupling reagents, and achieves high yield and efficient preparation
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example 1
Preparation of Intermediate:
(S)-1-sec-Butylthiourea
[0291]
[0292] To a solution of S— sec-butyl-amine (7.31 g, 0.1 mol) in chloroform (80 mL) at 0° C. was slowly added benzoyl isothiocyanate (13.44 mL, 0.1 mol). The mixture was allowed to warm to 10° C. and stirred for 10 min. The solvent was then removed under reduced pressure, and the residue was dissolved in MeOH (80 mL). An aqueous solution (10 mL) of NaOH (4 g, 0.1 mol) was added to this solution, and the mixture was stirred at 60° C. for another 2 h. The MeOH was then removed under reduced pressure, and the residue was stirred in water (50 mL). The precipitate was collected by vacuum filtration and dried to provide S-1-sec-butyl-thiourea (12.2 g, 92% yield). mp 133-134° C.; 1H NMR (500 MHz, DMSO-D6) δ 7.40 (s, 1H), 7.20 (br s, 1H), 6.76 (s, 1H), 4.04 (s, 1H), 1.41 (m, 2H), 1.03 (d, J=6.1 Hz, 3H), 0.81 (d, J=7.7 Hz, 3H); 13C NMR (125 MHz, DMSO-D6) δ 182.5, 50.8, 28.8, 19.9, 10.3; LRMS m / z 133.2 (M+H); Anal. Calcd for C5H12N2S:...
example 2
[0293] Preparation of Intermediate:
(R)-1-sec-Butylthiourea
[0294]
[0295] (R)-1-sec-Butylthiourea was prepared in 92% yield according to the general method outlined for Example 1. mp 133-134° C.; 1H NMR(500 MHz, DMSO) δ 0.80(m, 3H, J=7.7), 1.02(d, 3H, J=6.1), 1.41(m, 2H), (3.40, 4.04)(s, 1H), 6.76(s, 1H), 7.20(s, br, 1H), 7.39(d, 1H, J=7.2); 13C NMR (500 MHz, DMSO) δ: 10.00, 19.56, 28.50, 50.20, 182.00; m / z 133.23 (M+H); Anal. Calcd for C5H12N2S: C, 45.41; H, 9.14; N, 21.18; S, 24.25. Found: C, 45.32; H, 9.15; N, 21.14; S, 24.38.
Example 3
[0296] Preparation of:
[0297] To a solution of 3-amino-N-methyl-4-methylbenzamide hydrochloride (1.0 g, 5 mmol) in acetone (10 mL) at 0° C. was added pyridine (1.2 mL, 15 mmol) dropwise via syringe. 3-Methoxyacryloyl chloride (0.72 mL. 6.5 mmol) was added and the reaction stirred at room temperature for 1 h. The solution was cooled again to 0° C. and 1N HCl (1.5 mL) was added dropwise via pipet. The reaction mixture was stirred for 5 min, then wat...
example 3
3B. Example 3
[0298] To a 50 mL RBF containing the above compound 3A (0.5 g, 2.0 mmol) was added THF (2.5 mL) and water (2 mL), followed by NBS (0.40 g, 2.22 mmol), and the solution was stirred for 90 min. R-sec-butylthiourea (Ex. 2) (267 mg), was added, and the solution was heated to 75° C. for 8 h. Conc. NH4OH was added to adjust the pH to 10 followed by the addition of EtOH (15 mL). Water (15 mL) was added and the slurry stirred for 16 h, filtered, and washed with water to give Example 3 as a light brown solid (0.48 g, 69% yield, 98% purity). MS 347.1; HPLC 2.59.
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Abstract
- and crystalline forms thereof, wherein Ar is aryl or heteroaryl, L is an optional alkylene linker, and R2, R3, R4, and R5, are as defined in the specification herein, which compounds are useful as kinase inhibitors, in particular, inhibitors of protein tyrosine kinase and p38 kinase.
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